I just got the game, so I'm still in the "baby steps" stage. I've got the beginnings of a solar system, star and a few planets. I used aliens worlds, nothing from our solar system. Now I want to give them seasons, but whenever I try to alter the obliquity it goes right back to zero. I've tried typing in a number and sliding the slider, neither works. I'm assuming there's another setting I have to alter first, but I don't know what that setting would be.